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Insulation Structure Of Resin Pouring Current Transformer
Jun 12, 2018

The solid insulating medium formed by the mixture of synthetic resin, plastic, curing agent and so on has the characteristics of high insulation strength, good mechanical property, fire protection, moisture proof and so on. In a certain temperature condition, the mixed adhesive has good fluidity and can fill small gaps. It can be poured into various required shapes, so that metal and most of the insulating materials can be firmly bonded together. Therefore, the resin adhesive is the ideal insulation and forming medium for the transformer.

At present, the synthetic resin used for insulation is widely used in China. There are two kinds of unsaturated polyester resin and epoxy resin.

The unsaturated resin mixture is made up of 307-2 unsaturated polyester resin, silicon micro powder, cyclohexanone peroxide, naphthenic acid drill, epoxy iron red powder and so on. It is poured at room temperature without vacuum. The casting is cured at room temperature. The pouring method and equipment are simple and the price is cheap. The disadvantages are that there are bubbles in the body, low electrical strength and poor control of partial discharge, and the curing shrinkage is large, the mechanical strength is low, the heat resistance is poor, the vapor pressure is high, and the curing is easy to crack, so it should be used only in the low pressure products that do not check the partial discharge and other properties. Unsaturated resin cast mutual inductor and general dry low pressure mutual stolen goods have some advantages, such as not easy to damp. Strong and easy to damage, good fire resistance, easy operation and maintenance. The common unsaturated resin casting type current transformer is a single turn or bus transformer, and is poured into a four ring or rectangular shape. This kind of casting insulation is not adopted in the multi turn low voltage current transformer, because the casting process is more complicated.


Add: No.38 South Taoyuan Road, Yaozhuang Town,Jiashan County, Jiaxing City, Zhejiang Province, China
Contact person: Elva Zhuang&Sunny Ni
Tel:+86-573-84775555
Fax:+86-573-84776699
Phone:+86-13732570078
E-mail:sales9@great-relay.com
       sunny.ni@great-relay.com